716-040738-413
R,HE,4XX, W/FLAT

Edge ring with locating flat (OEM P/N 716-040738-413), plasma-facing confinement ring for LAM 300 mm etch systems

ESCT Fab Support P/N ES2099-045, 2nd-source new, OEM-compatible consumable ring for 300 mm plasma etch process chambers

The part described here, designated in the LAM nomenclature as “R, HE, 4XX, W/FLAT”, is an edge confinement ring carrying a machined locating flat on its outer profile. In plain engineering terms it is an annular plasma-facing consumable that surrounds the production wafer at the periphery of a 300 mm plasma etch process chamber. The abbreviated raw name encodes the essentials: “R” identifies it as a ring, the “W/FLAT” suffix denotes the keying or orientation flat ground into the outer diameter, and the numeric series tag places it within a defined family of dimensionally related rings used across the platform.

Within the chamber, this ring sits concentric with the electrostatic chuck and the wafer edge, bridging the transition between the silicon being processed and the surrounding chamber hardware. It is one of the most directly plasma-exposed components in the etch stack, taking the brunt of ion bombardment, radical flux and RF current that would otherwise terminate awkwardly at the wafer’s bevel. Because it operates exactly where edge non-uniformity originates, the ring’s geometry, material grade and condition translate immediately into measurable process behaviour at the outer few millimetres of every wafer.

As a scheduled consumable, the edge ring is replaced on a defined wafer-count or RF-hours interval. Maintaining a qualified second-source supply such as ESCT P/N ES2099-045 lets fabs hold preventive-maintenance cadence without being held hostage to single-source OEM lead times, while preserving the form, fit and function the recipe was qualified against.

Functional role of the edge ring in LAM 300 mm etch platforms

The edge ring is far more than a passive spacer. It actively shapes the plasma sheath, manages RF return paths and defines the thermal and chemical environment at the wafer perimeter. The machined flat is functional rather than cosmetic: it provides a positive angular reference so the ring seats in a single, repeatable orientation against the cathode assembly, which matters when the part is not perfectly rotationally symmetric or when downstream features must align. Its principal duties include:

• Extending the plasma sheath beyond the wafer edge so that ion trajectories over the outermost dies remain vertical rather than tilting inward.
• Confining and stabilising the plasma at the wafer periphery, suppressing edge arcing and stray discharge to grounded hardware.
• Providing a controlled RF return path and matching the local impedance environment seen at the wafer edge to that across its centre.
• Acting as a sacrificial surface that absorbs ion bombardment and polymer deposition that would otherwise attack permanent chamber hardware.
• Maintaining a stable thermal boundary at the wafer edge, minimising radial temperature gradients that drive etch-rate roll-off.
• Locating repeatably via the ground flat so that ring-to-cathode registration is identical after every preventive-maintenance swap.

Material and process performance

Edge rings for 300 mm etch chambers are manufactured from high-purity plasma-grade materials chosen for predictable erosion behaviour and low particle generation. Depending on the recipe set the part is qualified against, the family includes high-resistivity silicon, reaction-bonded or sintered silicon carbide, and high-density quartz, each delivering a different balance of erosion rate, electrical character and contamination control.

Material composition and purity

The ES2099-045 ring is produced to the purity and resistivity window the original component was specified to, so that its plasma chemistry contribution and sputter products match the qualified process. Trace metallic contamination is held to semiconductor-grade limits to protect device yield, and the bulk material is selected for uniform, isotropic erosion rather than localised pitting.

• Plasma-grade base material with controlled resistivity to preserve the local RF environment.
• Low trace-metal and mobile-ion content to protect against edge-die contamination.
• Homogeneous microstructure for slow, even sacrificial wear across the exposed face.

Dimensional and surface tolerances

Plasma uniformity at the wafer edge is exquisitely sensitive to ring geometry. The inner diameter step height, outer diameter, thickness and the position and angle of the locating flat are all held to tight tolerances so the seated ring presents the same surface profile to the plasma that the recipe expects.

• Inner-diameter step machined to control sheath shape relative to the wafer bevel.
• Flatness and parallelism held for intimate, gap-free seating on the cathode.
• Locating flat positioned and angled to give single-orientation, repeatable registration.
• Surface finish controlled to limit particle shedding and deposition adhesion.

Impact on tool performance and yield

Because the edge ring governs the outermost zone of every wafer, its condition is one of the clearest predictors of edge yield. A correctly specified, correctly seated ring keeps the edge exclusion band narrow and the process window wide; a worn, mis-seated or out-of-spec ring quietly erodes the value of every wafer that passes through the chamber.

• Edge etch-rate uniformity and critical-dimension control across the outer wafer radius.
• Etch profile and tilt angle on the outermost dies, directly affecting edge-die salvage.
• Particle performance, as a degraded ring becomes a defect source and lowers clean-wafer counts.
• Chamber matching, since ring-to-ring consistency keeps multiple chambers on a single recipe.
• Mean time between cleans and overall tool availability through predictable wear behaviour.

Common wear and failure modes

Erosion and thinning

Continuous ion bombardment steadily sputters material from the plasma-facing surface, lowering the inner step and thinning the ring. As it recedes, the sheath shape over the wafer edge changes, edge etch rate drifts and ion tilt increases until edge dies fall out of specification. This is the dominant, designed-in wear mode that sets the replacement interval.

Cracking and chipping

Repeated thermal cycling, mechanical handling during PM and any seating gap can initiate cracks or edge chips in the brittle ceramic or silicon. Fractures alter the local electric field, create particle sources and, if a fragment dislodges, can damage the wafer or chuck. A chipped locating flat is particularly serious because it compromises angular registration.

Deposition build-up and mis-seating

Polymer and by-product films accumulate on the ring and in the seating interface. Flaking deposits raise particle counts, while debris or a damaged flat under the ring prevents flush seating, opening RF and thermal discontinuities that distort the edge plasma and degrade uniformity well before the material is fully eroded.

Installation and replacement guidance

Edge ring replacement is a routine but precision preventive-maintenance task. Follow the tool owner’s documented procedure and observe contamination-control discipline throughout; the steps below summarise good practice in sequence.

• Vent the chamber, confirm RF and gas lock-out, and allow surfaces to cool to a safe handling temperature.
• Remove the worn ring and inspect the cathode seat for debris, deposition film and any erosion or damage.
• Clean the seating surface per the approved procedure so the new ring will sit flush and gap-free.
• Unpack the replacement using clean, powder-free gloves, handling only by the outer edge to avoid contaminating the plasma-facing surface.
• Lower the ring into place, using the machined flat to set the correct single orientation against the cathode, and confirm it is fully and evenly seated.
• Reassemble the chamber, pump down and leak-check, then run the prescribed season or burn-in recipe before production.
• Verify edge uniformity and particle performance on monitor wafers, and log the wafer-count or RF-hours baseline for the new ring.

Spare parts strategy for LAM etch consumables

Edge rings are high-turnover consumables, so supply continuity directly affects PM scheduling and chamber availability. ESCT Fab Support qualifies ES2099-045 as a second-source, OEM-compatible alternative so engineering teams can buffer stock and protect their maintenance cadence without compromise.

• Verified to the form, fit and function of OEM P/N 716-040738-413, including the locating flat geometry.
• Second-source new product, offering an alternative to single-source dependency.
• Typical lead time of 4-5 weeks to support planned preventive-maintenance buffering.
• Plasma-grade material and tolerance control to preserve recipe behaviour and yield.
• Cost-managed consumable supply that supports multi-chamber matching across a fleet.

Frequently asked questions

What does the “W/FLAT” in the part name mean?

It refers to a machined flat ground into the ring’s outer profile. The flat acts as an orientation key, so the ring seats against the cathode in one repeatable angular position so that registration is identical after every replacement.

Is this an original OEM part?

No. ES2099-045 is supplied as a second-source, new OEM-compatible component. It is verified to the form, fit and function of LAM OEM P/N 716-040738-413, but it is not an original OEM part and is not represented as one.

How often should the edge ring be replaced?

Replacement is driven by accumulated erosion, so it is scheduled on a wafer-count or RF-hours interval defined by your process and confirmed through edge-uniformity and particle monitoring. Heavier, higher-power recipes shorten the interval.

What happens if the ring is installed in the wrong orientation?

The locating flat exists precisely to prevent this. If the flat is ignored or the ring is forced, it can sit on debris or fail to register correctly, opening RF and thermal discontinuities that distort the edge plasma and degrade uniformity. Always align to the flat and confirm flush seating.

What material is the ring made from?

It is produced from a plasma-grade material, typically high-resistivity silicon, silicon carbide or high-density quartz depending on the qualified recipe, matched to the resistivity and purity window of the original component to preserve plasma chemistry and erosion behaviour.

What is the lead time for ES2099-045?

The typical lead time is 4-5 weeks. Because edge rings are high-turnover consumables, we recommend holding buffer stock aligned to your preventive-maintenance schedule to avoid any impact on chamber availability.

Summary

The “R, HE, 4XX, W/FLAT” edge ring (OEM P/N 716-040738-413, ESCT P/N ES2099-045) is a plasma-facing confinement consumable that surrounds the wafer in LAM 300 mm etch chambers. Its machined locating flat gives repeatable orientation, while its geometry, plasma-grade material and surface condition govern edge etch uniformity, sheath shaping, RF return and particle performance. Supplied by ESCT Fab Support as a second-source new component verified to form, fit and function, it lets fabs sustain preventive-maintenance cadence and protect edge yield without single-source supply risk.

Disclaimer: This part is supplied by ESCT Fab Support as a new, OEM-compatible second-source component, verified to the form, fit and function of Lam Research part number 716-040738-413. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Lam Research, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.